WL#2949: Add Meta File to CSV Storage Engine (ha_tina)

Currently, the CSV storage engine (ha_tina) doesn't have it's 'records' value
set properly. This causes issues such as BUG#13406. In this bug,
delete_all_rows returns '2' all the time, reguardless of how many rows there
were in the table. Also, other variables such as 'deleted' are not ever set to a
correct value. 

What's needed to have these values persist is a meta file, as implemented for
the Archive storage engine (ha_archive). This meta file keeps track of the
number of rows in the table, as well as determine if the table was closed
properly or not.